岩

1. Origins, structure, and basic meaning

• Structure: 岩 is read as いわ and is a noun for a large, solid natural rock or boulder.
• Basic usage: A large rock providing shelter appears in 大きな岩の陰, while coastal rocks appear in 岸の黒い岩.

2. Common pitfalls and similar expressions

• Large natural mass
  • In context, it often refers to a large solid mass forming part of the landscape rather than a small easily moved stone.
• Difference from 石
  • Compared with the broad word for a stone or worked stone material, this term better suits a large natural rock.